100cm= 1m
120cm= 1.2m
12 inch= 1 foot
15 inch= 1.25 foot
20-12 1/3=7 2/3 or 23/3. so there is a total of 23/3 ft available. We then take half of that for each side. 1/2 of 23/3= 1/2*23/3= 23/6
1/3 x 3 is one mile which is then 3/12 hours or 1/4 hours. Now multiply by 4 and you have
